rebase: update kubernetes to latest

updating the kubernetes release to the
latest in main go.mod

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

vendor/k8s.io/client-go/tools/leaderelection/leasecandidate.go

@@ -0,0 +1,202 @@
+/*
+Copyright 2024 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package leaderelection
+
+import (
+	"context"
+	"reflect"
+	"time"
+
+	v1 "k8s.io/api/coordination/v1"
+	v1alpha1 "k8s.io/api/coordination/v1alpha1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/fields"
+	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+	"k8s.io/client-go/informers"
+	"k8s.io/client-go/kubernetes"
+	coordinationv1alpha1client "k8s.io/client-go/kubernetes/typed/coordination/v1alpha1"
+	"k8s.io/client-go/tools/cache"
+	"k8s.io/client-go/util/workqueue"
+	"k8s.io/klog/v2"
+	"k8s.io/utils/clock"
+)
+
+const requeueInterval = 5 * time.Minute
+
+type CacheSyncWaiter interface {
+	WaitForCacheSync(stopCh <-chan struct{}) map[reflect.Type]bool
+}
+
+type LeaseCandidate struct {
+	leaseClient            coordinationv1alpha1client.LeaseCandidateInterface
+	leaseCandidateInformer cache.SharedIndexInformer
+	informerFactory        informers.SharedInformerFactory
+	hasSynced              cache.InformerSynced
+
+	// At most there will be one item in this Queue (since we only watch one item)
+	queue workqueue.TypedRateLimitingInterface[int]
+
+	name      string
+	namespace string
+
+	// controller lease
+	leaseName string
+
+	clock clock.Clock
+
+	binaryVersion, emulationVersion string
+	preferredStrategies             []v1.CoordinatedLeaseStrategy
+}
+
+// NewCandidate creates new LeaseCandidate controller that creates a
+// LeaseCandidate object if it does not exist and watches changes
+// to the corresponding object and renews if PingTime is set.
+// WARNING: This is an ALPHA feature. Ensure that the CoordinatedLeaderElection
+// feature gate is on.
+func NewCandidate(clientset kubernetes.Interface,
+	candidateNamespace string,
+	candidateName string,
+	targetLease string,
+	binaryVersion, emulationVersion string,
+	preferredStrategies []v1.CoordinatedLeaseStrategy,
+) (*LeaseCandidate, CacheSyncWaiter, error) {
+	fieldSelector := fields.OneTermEqualSelector("metadata.name", candidateName).String()
+	// A separate informer factory is required because this must start before informerFactories
+	// are started for leader elected components
+	informerFactory := informers.NewSharedInformerFactoryWithOptions(
+		clientset, 5*time.Minute,
+		informers.WithTweakListOptions(func(options *metav1.ListOptions) {
+			options.FieldSelector = fieldSelector
+		}),
+	)
+	leaseCandidateInformer := informerFactory.Coordination().V1alpha1().LeaseCandidates().Informer()
+
+	lc := &LeaseCandidate{
+		leaseClient:            clientset.CoordinationV1alpha1().LeaseCandidates(candidateNamespace),
+		leaseCandidateInformer: leaseCandidateInformer,
+		informerFactory:        informerFactory,
+		name:                   candidateName,
+		namespace:              candidateNamespace,
+		leaseName:              targetLease,
+		clock:                  clock.RealClock{},
+		binaryVersion:          binaryVersion,
+		emulationVersion:       emulationVersion,
+		preferredStrategies:    preferredStrategies,
+	}
+	lc.queue = workqueue.NewTypedRateLimitingQueueWithConfig(workqueue.DefaultTypedControllerRateLimiter[int](), workqueue.TypedRateLimitingQueueConfig[int]{Name: "leasecandidate"})
+
+	h, err := leaseCandidateInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
+		UpdateFunc: func(oldObj, newObj interface{}) {
+			if leasecandidate, ok := newObj.(*v1alpha1.LeaseCandidate); ok {
+				if leasecandidate.Spec.PingTime != nil && leasecandidate.Spec.PingTime.After(leasecandidate.Spec.RenewTime.Time) {
+					lc.enqueueLease()
+				}
+			}
+		},
+	})
+	if err != nil {
+		return nil, nil, err
+	}
+	lc.hasSynced = h.HasSynced
+
+	return lc, informerFactory, nil
+}
+
+func (c *LeaseCandidate) Run(ctx context.Context) {
+	defer c.queue.ShutDown()
+
+	c.informerFactory.Start(ctx.Done())
+	if !cache.WaitForNamedCacheSync("leasecandidateclient", ctx.Done(), c.hasSynced) {
+		return
+	}
+
+	c.enqueueLease()
+	go c.runWorker(ctx)
+	<-ctx.Done()
+}
+
+func (c *LeaseCandidate) runWorker(ctx context.Context) {
+	for c.processNextWorkItem(ctx) {
+	}
+}
+
+func (c *LeaseCandidate) processNextWorkItem(ctx context.Context) bool {
+	key, shutdown := c.queue.Get()
+	if shutdown {
+		return false
+	}
+	defer c.queue.Done(key)
+
+	err := c.ensureLease(ctx)
+	if err == nil {
+		c.queue.AddAfter(key, requeueInterval)
+		return true
+	}
+
+	utilruntime.HandleError(err)
+	c.queue.AddRateLimited(key)
+
+	return true
+}
+
+func (c *LeaseCandidate) enqueueLease() {
+	c.queue.Add(0)
+}
+
+// ensureLease creates the lease if it does not exist and renew it if it exists. Returns the lease and
+// a bool (true if this call created the lease), or any error that occurs.
+func (c *LeaseCandidate) ensureLease(ctx context.Context) error {
+	lease, err := c.leaseClient.Get(ctx, c.name, metav1.GetOptions{})
+	if apierrors.IsNotFound(err) {
+		klog.V(2).Infof("Creating lease candidate")
+		// lease does not exist, create it.
+		leaseToCreate := c.newLeaseCandidate()
+		if _, err := c.leaseClient.Create(ctx, leaseToCreate, metav1.CreateOptions{}); err != nil {
+			return err
+		}
+		klog.V(2).Infof("Created lease candidate")
+		return nil
+	} else if err != nil {
+		return err
+	}
+	klog.V(2).Infof("lease candidate exists. Renewing.")
+	clone := lease.DeepCopy()
+	clone.Spec.RenewTime = &metav1.MicroTime{Time: c.clock.Now()}
+	_, err = c.leaseClient.Update(ctx, clone, metav1.UpdateOptions{})
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (c *LeaseCandidate) newLeaseCandidate() *v1alpha1.LeaseCandidate {
+	lc := &v1alpha1.LeaseCandidate{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      c.name,
+			Namespace: c.namespace,
+		},
+		Spec: v1alpha1.LeaseCandidateSpec{
+			LeaseName:           c.leaseName,
+			BinaryVersion:       c.binaryVersion,
+			EmulationVersion:    c.emulationVersion,
+			PreferredStrategies: c.preferredStrategies,
+		},
+	}
+	lc.Spec.RenewTime = &metav1.MicroTime{Time: c.clock.Now()}
+	return lc
+}